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Introduction to Linux - A Hands on Guide

This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.

I am starting to play around with postfix a bit more at work. Sadly I am
not getting much direction and or assistance in learning what I need to
learn to get postfix to function 100% of the time on customers systems.

The process I am using is as follows:

yum install postfix
mkfifo /var/spool/postfix/pickup
service postfix start
chkconfig postfix on
then in a backup script i use the following command:

mailx -s "ftp logs ${license}" user1@123.net,user2@456.net < $logname

the situation is most of the time e-mails will go to only 1 recipient,
this is not acceptable. I need the e-mails to go to all clients all of
the time. Yes there is always the possibly they are getting caught up in
spam filters, but once that is eliminated as the issue the e-mails should
get to the target.

Perfect example is today, of 22 e-mails I should have received this
morning I only received 18. When I called the other person who should
have received e-mails as well from the same 22 locations, he only received
8.

Yesterday from the exact same stores I only received 9, while he received
14. This is to inconsistent for me to start having a clue how to fix. my
guess is that things are not configured properly and that would fall on me
to fix as I am not getting help from the company.

On a much smaller note I would also like to learn howto configure the
postfix.conf (what ever that file is) that it always sends the mailx from
the same user no matter what account is sending, specifically when it is
root that is sending the e-mail. I need root to be able to send the mailx
as user. Sadly the su user -c "mailx subject user1@123.net < file" does
not work due to the user being in a very unique environment and I can not
call the subject. As you can see from the line I place in the scripts I
need the subject line to be longer then just 1 word.

Thanks again for the help in advance, and I do plan on being at the
install fest next weekend if someone needs/wants to be there to help with
it at that time.